fill for electrical holes

[gpope]

I am wondering what is code in Michigan for filling electrical and plumbing holes that are drilled in the floor that go to a crawl space below. Is insulation enough or spray foam or rock wool if it is still used anymore?
These are holes that the electrican drilled to run the electrical down the wall and into the crawl space, so these holes do contain wire in them.
Thanks
Gary

[Vector]

Every job site I've ever been on they have used polyurethane foam. Generally the insulation sub will handle it, but generally that's because the other subs compensate them, because it's generally more efficient to have one sub handle it rather than each sub filling their own.

From personal expereince, I use the Hilti foam gun, but it's spendy if you just have a small number of holes to fill. The Hilti foam in cans works fine for a small job. The "Great Stuff" foam is not so great (but will work).

For larger holes I'd use a fire-stop putty.

Of course, this is in MN, so it might be different.

[Sweep]

Is the requirement for "fireblocking" or "firestopping"?

"Firestopping" consists of materials installed in small penetrations of fire rated assemblies (walls, floors and ceilings). The materials and their method of application must be UL listed in order to maintain the UL fire resistance rating of the assembly.

"Fireblocking" consists of materials installed in concealed spaces to resist the migration of fire and hot gases.
•IRC R602.8 prescriptive materials: 2" nominal lumber, 2 thicknesses of 1" nominal lumber, 23/32" wood structural panels with joints backed by the same, 3/4" particle board with joints backed by the same, 1/2" gypsum board, 1/4" cement based millboard, mineral wool or fiberglass, or other approved materials installed in such a manner to be securely retained in place.
•Materials tested to ASTM E 136: (not IRC recognized)
These include primarily gunnable tube type caulks
•Materials tested to ASTM E 814 (covered in ICC-ES Legacy Report NER-645 issued to Dow Chemical Co Dec 2003)
These include Great Stuff and Great Stuff Pro expanding polyurethane foam products.
Other foam-in-place products may also be acceptable: http://www.fomo.com/resources/technical-bulletins/PU-Foam-For-Use-In-Fireblock-Applications.aspx

Any properly applied UL classified firestopping material should be acceptable for fireblocking although usually considerably more expensive.